JPH01140817A - High frequency power control circuit - Google Patents

Abstract

PURPOSE:To shorten a processing time by providing first and second switching circuits which are controlled by means of a same selection signal and select and output voltages that resistances have voltage-divided. CONSTITUTION:An input voltage 5 is divided into voltage-divided voltages V1, V2,... by a voltage resistance group 9. A divided voltage designating transmission power when transmitting sound is present among the divided voltages is inputted to the input terminal of the first switching circuit 1. A divided voltage designating transmission power when transmitting sound is absent is inputted to the input terminal of the second switching circuit 2. The switching circuits 1 and 2 connect one among input terminals X0, X1,... to an output terminal based on the selection signal, and output the divided voltages. A control signal 4 which has decided the presence or absence of transmitting sound selects either of the output voltage of the switching circuits 1 or 2 as a reference signal 6. The reference signal 6 can control the transmission power of a radio communication equipment 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high frequency power control circuit for a wireless communication device.
In particular, the present invention relates to a high-frequency power control circuit having a function of controlling its own transmission power during a silent section of a transmitted voice input.

[Background Art] In recent years, wireless devices have become smaller and more portable, and the number of devices that operate on batteries is rapidly increasing. A modified element of portable wireless devices can be increased battery life;
It is greatly influenced by power consumption during transmission.

As a control circuit to reduce power consumption and make effective use of batteries, the system transmits only the voiced sections of the outgoing voice, and reduces or stops the transmitting power during silent sections to reduce power consumption. There is something.

Furthermore, in the car telephone systems used in North America and the United Kingdom, a circuit is used that controls the mobile device to always maintain appropriate transmission power based on commands from the base station.

As a general conventional example of the latter control circuit, as shown in FIG. For example, the reference voltage 6 may be selected by 1 and set as the reference voltage 6 of the power control circuit.

As a means to easily implement the two control circuits described above, conventionally, a control signal indicating the presence or absence of transmitted voice and a command from a base station are converted into a selection signal by software.
Consideration has been given to ways to obtain optimal transmission power.

[Problems to be Solved] The conventional high frequency power control circuit described above has the following problems.

The control signal simply depends on the presence or absence of the transmitted voice,
It is completely independent of transmission power control from the base station. Since these two independent processes must be handled separately, there is a problem in that the amount of processing required by the software becomes extremely large.

Also, as the amount of processing by the software increases, the processing time becomes longer, so the control signal, X2! This resulted in a large delay between inputting the selection signal and starting up the transmitter by changing the transmission power by a certain u%, which could cause problems such as audio clipping.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a high-frequency power control circuit that can reduce the amount of software processing and, accordingly, shorten the processing time.

[Means for Solving Problems] In order to achieve the second object, the present invention divides a DC voltage using a plurality of resistors, selects one of the divided voltages, and uses it as a reference voltage. A high-frequency power control circuit that obtains multi-stage high-frequency output by using a first and second switching circuit that is controlled by the same selection signal and selects and outputs the voltage divided by the resistor, The configuration is such that one of the outputs of the circuit is selected by a control signal.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a more detailed circuit block diagram. The same n-bit selection signal 3 is input to both the switching circuit 1 and the switching circuit 2. Both switching circuits 1 and 2 have 2n input terminals X. ~X
It has 2'-1.

The input voltage 5 is divided into divided voltages v1 to V by the voltage dividing resistor group 9.
The pressure is divided into ♂. Of the divided voltages, the divided voltage V specifies the transmission power when the transmitting voice is present, (1≦m≦21
1) is input to the input terminal of the first switching circuit l.

In addition, the divided voltage V that specifies the transmission power when the transmitted voice is silent
s-h (1≦m-≦2″) is input to the input terminal of the second switching circuit 2.

The switching circuits 1.2 then select input terminals X based on the selection signal 3, respectively. 〜X2□″−+ovsfresistance x− is connected to the output terminal, and 1 divided voltage y ,,V ＋＊−k
Output. Furthermore, either the control signal 4 that determines the presence or absence of the transmitted voice or the output voltage of the switching circuit 1 or 2 is selected as the reference signal 6.

Next, a more detailed configuration based on FIG.

Explain the operation.

The first and second switching circuits 1 and 2 are manufactured by NEC Corporation, %
It can be configured using PD 4051 BC. To select these switching circuits 1.2, for example, an inhibit (INHIBI) at the input terminal of each circuit 1.2 is required.
T) A function can be used. That is, the first switching circuit l
INII! via NOT circuit 7. A control signal is manually input to the BIT terminal, and the INII signal is directly input to the second switching circuit 2.
By inputting a control signal to the IBIT terminal, the operation of either switching circuit 1 or 2 is always stopped and the output voltage is selected regardless of the logic of the control signal.

Here, the selection signal 3 is 3 bits, 1, for example (1, 0,
Consider the case 1). At this time, each switching circuit 1.2
Assuming that Xs is selected as the input terminal of , the first switching circuit 1 connects v3 and the second switching circuit 2 connects V to the output terminal (OUT terminal).

Furthermore, if the control signal is at a high level when there is a transmitted voice, the INIIIBI of the second switching circuit 2
Since the T terminal becomes high level, the OMIT terminal becomes high impedance. On the other hand, INH of the first switching circuit l
Since the terminal III is at a low level, the output of the first switching circuit l, that is, V3, is obtained as the reference voltage 6.

When the call becomes silent, the logic of the control signal 4 is reversed, so the 0υT terminal of the first switching circuit 1 becomes high impedance, and as a result, the output of the second switching circuit 2 is obtained as the reference voltage. . This reference voltage 6 controls the transmission power of the wireless communication device 10.

The above method uses the INHIBIT function of the switching circuit, or as another example, as shown in FIG. 3, the first and second switching circuits 1 and 2 are always operated and the control signal is By means of a third switching circuit 8, which operates according to 4, it is also possible to select the output of the switching circuit 1.2.

[Effects of the Invention] As described above, according to the present invention, the amount of power control processing in software can be reduced, and the processing time can be shortened accordingly.
This has the effect of realizing rapid high-frequency power control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a circuit diagram showing the same embodiment in more detail, FIG. 3 is a block diagram showing another embodiment of the present invention, and FIG. 1 is a configuration diagram showing a conventional example. l: First switching circuit 2: Second switching circuit 3; Selection signal 4: Control signal 5: DC voltage 6, reference signal 7: NOT circuit 9: Minute r resistance group

Claims (1)

[Claims] In a high-frequency power control circuit that divides a DC voltage with multiple resistors, selects one of the divided voltages, and uses it as a reference voltage to obtain multi-stage high-frequency output, the same selection signal High-frequency power control comprising first and second switching circuits that select and output voltages that are controlled and divided by the resistors, and one of the outputs of these switching circuits is selected by a control signal. circuit.